Novel antiprotease acid alpha-galactosidase AGA36 and gene and application thereof

A galactosidase and protease-resistant technology, applied in the field of new α-galactosidase AGA36 and its gene, and the recombinant vector containing the gene, can solve the problem of inability to hydrolyze various substrates, and achieve excellent hydrolysis of various Substrate capacity, effect of strong protease resistance

Active Publication Date: 2010-05-26
GUANGDONG VTR BIO TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are many kinds of oligosaccharides and polysaccharides containing α-galactosidic bonds, but the substrate specificity of the previously reported α-galactosidase cannot hydrolyze a variety of substrates, and each has its limitations in application

Method used

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  • Novel antiprotease acid alpha-galactosidase AGA36 and gene and application thereof
  • Novel antiprotease acid alpha-galactosidase AGA36 and gene and application thereof
  • Novel antiprotease acid alpha-galactosidase AGA36 and gene and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Example 1 Isolation of Rhizopus AG708 (Rhizopus.sp.AG708) and its enzyme-producing properties

[0043] After the strain Rhizopus AG708 (Rhizopus.sp.AG708) was grown on PDA medium for 3-5 days, the primers designed according to the conserved sequence of filamentous fungal 18S rDNA were used to amplify the 18S rDNA of the strain by PCR, and the sequencing results were compared with those in the Genbank database. According to the nucleotide sequence comparison of AG708, the 18s rDNA nucleotide sequence of AG708 has the highest similarity of 99% with Rhizopus.oryzae CBS 278.38 (Genbank accession No.AB250174), and with R. ) and R.caespitosus CBS427.87 (Genbank accession No.AB250168) have a similarity of 97%, which proves that the bacterial strain is Rhizopus, and it is named Rhizopus.sp.AG708. Soybean meal was added as an inducer and carbon source to the enzyme-producing medium (4% K 2 HPO 4 , 0.28% (NH 4 ) 2 SO 4 , 0.12% CaCl 2 , 0.12% Urea, 0.12% MgSO 4 , 0.02% Mann...

Embodiment 2

[0044] Cloning of embodiment 2 Rhizopus α-galactosidase coding gene aga36

[0045] Genomic DNA extraction of Rhizopus (Rhizopus.sp.AG708): take the Rhizopus liquid cultured at 30°C for 7 days and centrifuge at 6000rpm for 10min. Take 100mg of mycelia and add 500μL of sterile water to wash, centrifuge to get the precipitate. The precipitate was resuspended in 500 μL extract mixture, incubated at 37°C for 60 min, and centrifuged at 10,000 rpm for 10 min to remove the precipitate. The supernatant was extracted sequentially with equal volumes of phenol, phenol:chloroform, and chloroform. Take the upper layer solution and add 0.6-1 times the volume of isopropanol to precipitate at room temperature for 10 minutes. Centrifuge at 12000rpm for 15min. The precipitate was washed with 70% ethanol, centrifuged slightly, dried and dissolved in 30 μL sterile water for later use.

[0046] The degenerate primers P1: 5'-TYGTBMTKGAYGAYGGYTGG-3' and P2: 5'-GACCATYTCNGGYTCNAMCC-3' were designe...

Embodiment 3

[0048] Example 3 Activity analysis of α-galactosidase.

[0049] Enzyme activity was determined by the pNPG method. Dissolve pNPG in 0.1mol / L McIlvaine buffer to make the final concentration 2mmol / L. Mix 20 μL of enzyme solution, 230 μL of McIlvaine buffer and 250 μL of 2mM pNPG, and shake well. After incubating at 37°C for 5 min, 1.5 mL of 1M Na was added to the reaction solution 2 CO 3 solution to terminate the reaction. The OD value was measured at 405nm, and the enzyme activity was expressed by the production of p-nitrophenol (pNP). After adding enzyme solution and buffer to the control tube, add Na first 2 CO 3 The solution was then added with pNPG solution.

[0050] Enzyme activity (U / mL) unit definition: The amount of enzyme needed to decompose pNPG to release 1 μmol pNP per minute at 37°C is defined as one enzyme activity unit.

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Abstract

The invention relates to the field of gene engineering, in particular providing a novel antiprotease acid alpha-galactosidase AGA36 and a gene and an application thereof. The amino acid sequence of the alpha-galactosidase AGA36 is shown in SEQ ID NO.1, and the enzyme has appropriate acting pH value, strong resistance to metal ions and surfactants, strong protease resistance and better capacity for hydrolyzing various substrates, and can be applied to the feedstuff and food service industries as a feedstuff or a food additive.

Description

technical field [0001] The invention relates to the field of genetic engineering, in particular, the invention relates to a new alpha-galactosidase AGA36 and its gene, a recombinant vector containing the gene and application thereof. Background technique [0002] α-galactosidase (α-galactosidase, EC3.2.1.22) is melibiase, which belongs to the class of exoglycosidases and can specifically catalyze the hydrolysis of α-galactosidic bonds at the non-reducing ends of sugar chains. Not only can it hydrolyze oligosaccharides containing α-galactosidic bonds, but it can also catalyze polysaccharides containing such bonds. Raffinose, stachyose, and verbascose are oligosaccharides widely present in legumes. Under the action of α-galactosidase, these oligosaccharides can be decomposed into D-galactose and other corresponding monosaccharides. sugars and oligosaccharides. [0003] Soybean meal is a very good plant-based protein feed raw material, generally used in the amount of 25 to 30...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12N1/14C12N9/40C12N15/56C12N15/63C12N1/21C12N1/19A23K1/16A23L1/305C12R1/225C12R1/07C12R1/645C12R1/19C12R1/845A23K20/189A23L33/17
Inventor 史宝军胡爱红罗长财曹雅男
Owner GUANGDONG VTR BIO TECH
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